49 lines
1.2 KiB
Rust
49 lines
1.2 KiB
Rust
use proc_macro2::{Ident, TokenStream};
|
|
use quote::format_ident;
|
|
|
|
use syn;
|
|
use try;
|
|
|
|
pub fn wrap_in_const(
|
|
serde_path: Option<&syn::Path>,
|
|
trait_: &str,
|
|
ty: &Ident,
|
|
code: TokenStream,
|
|
) -> TokenStream {
|
|
let try_replacement = try::replacement();
|
|
|
|
let dummy_const = if cfg!(underscore_consts) {
|
|
format_ident!("_")
|
|
} else {
|
|
format_ident!("_IMPL_{}_FOR_{}", trait_, unraw(ty))
|
|
};
|
|
|
|
let use_serde = match serde_path {
|
|
Some(path) => quote! {
|
|
use #path as _serde;
|
|
},
|
|
None => quote! {
|
|
#[allow(unused_extern_crates, clippy::useless_attribute)]
|
|
extern crate serde as _serde;
|
|
},
|
|
};
|
|
|
|
quote! {
|
|
#[doc(hidden)]
|
|
#[allow(non_upper_case_globals, unused_attributes, unused_qualifications)]
|
|
const #dummy_const: () = {
|
|
#use_serde
|
|
#try_replacement
|
|
#code
|
|
};
|
|
}
|
|
}
|
|
|
|
#[allow(deprecated)]
|
|
fn unraw(ident: &Ident) -> String {
|
|
// str::trim_start_matches was added in 1.30, trim_left_matches deprecated
|
|
// in 1.33. We currently support rustc back to 1.15 so we need to continue
|
|
// to use the deprecated one.
|
|
ident.to_string().trim_left_matches("r#").to_owned()
|
|
}
|